In my opinion there are 2 things that make the government come to bitcoin :

1. Bitcoin is vulnerable to hacking

With such a large exchange rate, do not be surprised if many are trying to hack or break into it.
The financial system at a local bank can be hacked by nosy hands. Though the local bank has been supervised directly by the FSA and approved by the Indonesian government. What about Bitcoin that has been officially banned? Of course every risk is no longer the responsibility of the government.
Money in digital form is not always safe. As smart as you hide the Bitcoin wallet access code, it still has the possibility to be hacked. If the bitcoin fragments you have are lost, then no one can guarantee the alias can not come back again.

2. Often Stuck Money Laundering to Terrorist Funding

Quite worrying indeed. Once the Indonesian government bans Bitcoin, it is naturally easy to affiliate with illicit practices. For example, money laundering from corruptors or mafias and terrorist groups to launch terrorist acts here and there. Do you want to be equaled with them?
In addition, Bitcoin is also vulnerable to being used for various other crime. For example prostitution. Because, Bitcoin users are allowed to trade using a cover.